Linde HPR-02 Self regulating pumps for open circuit operation

Linde HPR-02 Self-regulating pumps for open circuit operation

Table of Contents

Linde is a manufacturer of axial piston pumps for open and closed circuits. The company’s offerings include variable and self regulating pumps. The products are suitable for a peak pressure of up to 500 bar in heavy duty hydraulic applications.

Legal emission regulations force manufacturers of mobile machinery to optimize the noise emission of their products. Since secondary measures tend to be expensive and less efficient Linde Hydraulics prefers to fight the noise where it is generated: by optimally connecting an additional volume directly next to the commutation of the HPR-02 pump, Linde Hydraulics invented the SPU silencer.

The adaptive SPU reduces pressure pulsations in the regulating pump over the entire range of operation – without loss of power.


Design characteristics

  • axial piston pump in swashplate design for high pressure open circuit systems
  • clockwise or counter clockwise rotation
  • self-priming at high nominal speed
  • tank pressurization or swash angle reduction for high speed applications
  • adaptive noise optimization SPU
  • decompression fluid is discharged via pump housing to keep suction side calm
  • exact and robust load sensing controllers with or without swash plate position feedback

Product advantages

  • optimum interaction with Linde LSC control valves and LinTronic
  • energy saving operation by ‘flow on demand’-control
  • dynamic response
  • excellent suction up to rated speed
  • noise optimization over the whole range of operation
  • compact design
  • high power density
  • high reliability
  • long working life

Technical Data

HPR-02 Desc 55 75 95 105 135 165 210 280 105D 125D 165D
Max. displacement cc/rev 55 75.9 95 105 135.7 163.6 210.1 281.9 210 250 331.2
Max. operating speed (without tank pressurization) rpm 2700 2500 2500 2500 2350 2400 2100 2000 2450 2400 2100
Max. oil flow* l/min 148.5 189.8 237.5 246.8 312.1 392.6 441.2 563.8 514.5 600.0 695.5
Nominal pressure bar 420 420 350 420 420 350 420 420 420 350 420
Max. pressure** bar 500 500 420 500 500 420 500 500 500 420 500
Torque (Δp=420 bar) Nm 368 507 529 702 907 911 1404 1884 1245 1245 1964
Corner power kW 104 132.8 138 172.7 218.5 229 308.8 394.7 319.4 337 431.8
Weight approx. (without oil) kg 39 39 44.5 50 65 74 116 165 96 113 177

* theoretical data of a single unit without efficiency effects
** highest transient pressure, that can temporarily occur

Operational parameters. Lifetime recommendations

Linde high-pressure units are designed for excellent reliability and long service life. The actual service life of a hydraulic unit is determined by numerous factors. It can be extended significantly through proper maintenance of the hydraulic system and by using high-quality hydraulic fluid.

Beneficial conditions for long service life

  • Speed lower continuous maximum speed
  • Operating pressure less than 300 bar ∆p on average
  • Max. pressure only at reduced displacement
  • Viscosity 15 … 30 cSt
  • Power continuous power or lower
  • Purity of fluid 18/16/13 in ac. with ISO 4406 or better

Adverse factors affecting the service life

  • Speed between continuous maximum speed and intermittent maximum speed
  • Operating pressure of more than 300 bar ∆p on average
  • Viscosity less than 10 CST
  • Power continuous operation close to max. power
  • Purity of fluid lower than 18/16/13 in acc. with ISO 4406

The Linde Synchron Control System (LSC-System) for open loop hydraulic circuits enables demand-orientated pump volume control based on load sensing technology (LS technology). An LSC-System compensates for the effect of varying loads, varying numbers of actuators, and different load levels at different actuators. This happens automatically, thereby making machine operation more convenient since, unlike in other systems, continuous corrective action is no longer required. The LSC-System enables high-efficiency hydraulic systems to be realized that are strictly orientated to the machine functions. Our application specialists will be happy to provide advice for individual machine configurations.


  • Demand-oriented pump control
  • Excellent precision control characteristics without readjustment
  • Exact reproducibility of machine movements through exact control of actuators
  • Dynamic response characteristics
  •  Load-independent, synchronous movements of several actuators
  • “Social” oil distribution even in the event of overload
  • Automatic venting of directional control valve end caps
  •  Optimum movement continuity even for combined movements

Further optional functions such as

  • Priority control of individual actuators
  • Output control
  • High-pressure protection
  • Regeneration function
  • Combined function shuttle valve
  • Load holding function

Machine Equipment

  • Customized system design for optimum implementation of customer requirements
  • Optimum utilization of the installed power with simultaneous improvement of energy consumption
  • High flexibility through manifold plates
  • Compact, integrated solutions
  • Modular design of valve sections
  • Add-on cylinder valves for direct and fast cylinder supply, no additional hose burst protection required
  • Optimized piping


  • Perfect matching of the individual operating functions for customized machine characteristics
  • Efficient and dynamic machine control for short operating cycles
  • Optimized energy balance for reduced fuel consumption and enhanced handling performance
  • Simple and safe machine operation for non-fatigue and efficient working
  • Unsurpassed reliability even under harsh operating conditions
  • Reduced installation times

Download Datasheet: Linde HPR-02 Self-regulating pumps for open circuit operation


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